<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
       <div>
            <input type="text" name="username" id="" v-mode="username">
            <input type="text" name="password" id="">

       </div>

    </div>

</body>
<script src="./js/vue2.7.js"></script>
<script>
    const app = new Vue({
        el: '#app',
        data: {
           username:"hello"
        },
        methods: {
          
        }



    });
</script>

</html>